Continuous Cooling Transformation Behavior of Multi-Component White Cast Iron

Abstract

  Continuous cooling transformation behavior of Fe-5 % Cr-5 % Mo-5 % W-5 % V-2 % Co alloys with 2.0 and 2.8 % C (mass %) was investigated at two austenitizing temperatures, 1273 K and 1373 K. In spite of the difference in carbon content and austenitizing temperature, pearlite and bainite transformations were found to separate to the top and bottom individually. Regardless of the austenitizing temperature, the bainite nose was located at the short time side than the pearlite nose in low carbon cast iron. In the high carbon cast iron austenitized at 1273 K, the pearlite and bainite nose times were more or less the same, but a delay was seen in the bainite nose time in iron austenitized at 1373 K. Irrespective of the austenitizing temperature, the temperatures of pearlite and bainite noses and bainite nose time were similar in both irons. However, the time of pearlite nose in low carbon cast iron was located at the long time side compared with high carbon cast iron. The Ms temperatures appeared from 340 K to 495 K but the Mf temperatures were below room temperature. The Ms temperatures were found to be higher in the low carbon cast iron and lower in both irons austenitized at 1373 K.